partask.java

一个java工作流引擎

package org.jbpm.ant;

import java.io.File;
import java.io.IOException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.Jar;
import org.apache.tools.ant.types.ZipFileSet;
import org.apache.tools.zip.ZipOutputStream;

/**
 * An extension of <jar>to create a jBpm process archive archive. Contains special treatment for files
 * processdefinition.xml.
 * 
 * (The Par task is a shortcut for specifying the particular layout of a PAR file. The same thing can be accomplished
 * by using the prefix and fullpath attributes of zipfilesets in a Zip or Jar task.)
 * 
 * The extended zipfileset element from the zip task (with attributes prefix, fullpath, and src) is available in the
 * Par task.
 * 
 * Behavior: [1] processdefinitionxml attribute must be specified. The file specified there will end up as
 * ./processdefinition.xml in the resulting PAR [2] The nested classes element specifies a FileSet. It is optional. All
 * files included in this fileset will end up in the classes directory of the par file
 * 
 * @author Raka Angga Jananuraga ([e-mail])
 */
public class ParTask extends Jar {
  
	private File processDefinitionDescriptor;

	public ParTask() {
		archiveType = "par";
		emptyBehavior = "create";
	}

	public void setProcessdefinitionxml(File descr) {
		processDefinitionDescriptor = descr;
		if (!processDefinitionDescriptor.exists()) {
			throw new BuildException("Process definition descriptor: " + processDefinitionDescriptor + " does not exist.");
		} else {
			ZipFileSet fs = new ZipFileSet();
			fs.setFile(processDefinitionDescriptor);
			fs.setFullpath("processdefinition.xml");
			addFileset(fs);
			return;
		}
	}

	public void addClasses(ZipFileSet fs) {
		fs.setPrefix("classes/");
		addFileset(fs);
	}

	protected void initZipOutputStream(ZipOutputStream zOut) throws IOException, BuildException {
		if (processDefinitionDescriptor == null && !isInUpdateMode()) {
			throw new BuildException("processdefinitionxml attribute is required", getLocation());
		}

		super.initZipOutputStream(zOut);
		return;
	}

	protected void zipFile(File file, ZipOutputStream zOut, String vPath, int mode) throws IOException {
		super.zipFile(file, zOut, vPath, mode);
	}

	protected void cleanUp() {
		super.cleanUp();
	}
}